Interestingly, apparently rapiers had originally been planned for FFXIV 1.0 as a class called 'Fencer' ('FCR') for short, but was never developed or implemented beyond a dummied-out reference in the 1.0 game client files to 'fencing' as a weapon skill type. Whatever concept ideas SE had came up with for this class, if any, would have almost certainly ended up being used for RDM anyway though so it's rather moot now.